PIC18LF2321-I/SO Microchip Technology, PIC18LF2321-I/SO Datasheet - Page 92
![IC PIC MCU FLASH 4KX16 28SOIC](/photos/6/59/65909/150-28-soic_sml.jpg)
PIC18LF2321-I/SO
Manufacturer Part Number
PIC18LF2321-I/SO
Description
IC PIC MCU FLASH 4KX16 28SOIC
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC18F2221-ISO.pdf
(402 pages)
3.PIC18F2221-ISO.pdf
(8 pages)
4.PIC18F2221-ISO.pdf
(30 pages)
5.PIC18F2221-ISO.pdf
(46 pages)
6.PIC18F2321-IML.pdf
(396 pages)
Specifications of PIC18LF2321-I/SO
Core Size
8-Bit
Program Memory Size
8KB (4K x 16)
Core Processor
PIC
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Number Of I /o
25
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 10x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-SOIC (7.5mm Width)
Controller Family/series
PIC18
No. Of I/o's
25
Eeprom Memory Size
256Byte
Ram Memory Size
512Byte
Cpu Speed
40MHz
No. Of Timers
4
Processor Series
PIC18LF
Core
PIC
Data Bus Width
8 bit
Data Ram Size
512 B
Interface Type
EUSART, I2C, MSSP, SPI
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
25
Number Of Timers
4
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, PG164120, ICE4000, ICE2000, DV164136
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 10 Channel
Package
28SOIC W
Device Core
PIC
Family Name
PIC18
Maximum Speed
40 MHz
Operating Supply Voltage
2.5|3.3|5 V
A/d Bit Size
10 bit
A/d Channels Available
10
Height
2.31 mm
Length
17.87 mm
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2 V
Width
7.49 mm
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
- PIC16F616T-ISL PDF datasheet
- PIC18F2221-ISO PDF datasheet #2
- PIC18F2221-ISO PDF datasheet #3
- PIC18F2221-ISO PDF datasheet #4
- PIC18F2221-ISO PDF datasheet #5
- PIC18F2321-IML PDF datasheet #6
- Current page: 92 of 402
- Download datasheet (7Mb)
PIC18F2221/2321/4221/4321 FAMILY
8.5
Data EEPROM memory has its own code-protect bits in
Configuration
operations are disabled if code protection is enabled.
The microcontroller itself can both read and write to the
internal data EEPROM, regardless of the state of the
code-protect Configuration bit. Refer to Section 24.0
“Special Features of the CPU” for additional
information.
8.6
To protect against spurious EEPROM writes, various
mechanisms have been implemented. On power-up,
the WREN bit is cleared. In addition, writes to the
EEPROM are blocked during the Power-up Timer
period (T
The write initiate sequence and the WREN bit together
help prevent an accidental write during Brown-out
Reset, power glitch or software malfunction.
EXAMPLE 8-3:
DS39689F-page 92
LOOP
Operation During Code-Protect
Protection Against Spurious Write
PWRT
CLRF
BCF
BCF
BCF
BSF
BSF
MOVLW
MOVWF
MOVLW
MOVWF
BSF
BTFSC
BRA
INCFSZ
BRA
BCF
BSF
, parameter 33).
Words.
EEADR
EECON1, CFGS
EECON1, EEPGD
INTCON, GIE
EECON1, WREN
EECON1, RD
55h
EECON2
0AAh
EECON2
EECON1, WR
EECON1, WR
$-2
EEADR, F
LOOP
EECON1, WREN
INTCON, GIE
DATA EEPROM REFRESH ROUTINE
External
read
; Start at address 0
; Set for memory
; Set for Data EEPROM
; Disable interrupts
; Enable writes
; Loop to refresh array
; Read current address
;
; Write 55h
;
; Write 0AAh
; Set WR bit to begin write
; Wait for write to complete
; Increment address
; Not zero, do it again
; Disable writes
; Enable interrupts
and
write
8.7
The data EEPROM is a high-endurance, byte
addressable array that has been optimized for the
storage of frequently changing data. Such data is
typically updated at least one time within the number of
writes defined by specification, D124. If any location
storing data is not written at least this often, the data
EEPROM array must be refreshed. For this reason,
values that change infrequently, or not at all, should be
stored in Flash program memory.
A simple data EEPROM refresh routine is shown in
Example 8-3.
Note:
Using the Data EEPROM
If data EEPROM is only used to store con-
stants and/or data that changes often, an
array refresh is likely not required. See
specification, D124.
© 2009 Microchip Technology Inc.
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